Cure cycle optimization of an inorganic polymer matrix material for high temperature fiber reinforced composites

We investigated the potential effects of inorganic polymer processing conditions on the residual stress generation of fiber reinforced inorganic polymer matrix composites. By optimizing various stages of processing it was found that process-induced shrinkage can be reduced by as much as 20%, while simultaneously, the compression strength can be improved by over 30% compared to baseline processing parameters. Further with the optimization of the process parameters, the pore diameter reduced by over 65%, while the relative density increased by a little over 5%. These results suggest high temperature dimensional stability and reduced pore content. Also SEM images indicate a continuous thermodynamic transformation in the bonding strength between the precipitated particles. Thus, it is demonstrated that, through the process modification, a path exists to reduced cure shrinkage, high mechanical strength and thermodynamic stability that results in a potential reduction in residual stresses in continuous fiber reinforced, inorganic matrix composites.